| 1. |
Understand and validate customer concern.
Inspect visible system components for obvious damage or conditions
that may cause concern. |
| 2. |
Inspect for related bulletins, recall/field
actions and preliminary information. |
| 3. |
Verify symptom is not exclusively a
mechanical concern. |
| 4. |
Connect a suitably programmed scan
tool, perform Vehicle DTC Information function and verify at least
one control module communicates with scan tool. |
| 5. |
Verify there are no control module
Internal hardware performance DTCs set. |
| 6. |
Ignition ON, command MIL ON and OFF
with scan tool. MIL should turn ON and OFF as commanded. |
| 7. |
Ignition ON, command MIL ON and OFF
with a scan tool while observing following control circuit status
parameters: |
| |
a. |
MIL control circuit low voltage test
status. |
| |
b. |
MIL control circuit open test status. |
| |
c. |
MIL control circuit high voltage test
status. |
| |
d. |
Each parameter should toggle between
OK and Not Run or Not Run and OK. |
| 8. |
Ignition OFF, disconnect MIL electrical
harness connectors. Ignition ON, MIL should not illuminate. If MIL
is illuminated, test MIL control circuit terminal for a short to
ground. If circuit tests normal, replace cluster. |
| 9. |
Ignition ON, connect a 3A fused jumper
wire between MIL control circuit terminal and ground. MIL should
illuminate. If MIL does not illuminate, test MIL control circuit
for a short to voltage, or an open/high resistance. If circuit tests
normal, replace MIL bulb. |
| 10. |
If all circuits/connections test normal,
replace ECM. |
|
Ignition Switch, Replace
Multi-Function Switch, Replace